Abstract: Disclosed is a connecting rod for a combustion engine, comprising a small connecting-rod eye that is provided with a plain bearing surface and is used for accommodating a piston pin, and a large connecting-rod eye which is provided with a plain bearing surface and embraces a crankshaft journal. In order to very effectively and inexpensively prevent the piston pin and the crankshaft journal of the connecting rod from jamming and wearing off, a self-lubricating coating made of a thermally cured resin which contains embedded solid lubricant particles is applied directly to at least one of the plain bearing surfaces by means of rotary atomization.

Abstract: The present invention relates to a method for manufacturing a piston ring (10) for internal combustion engines, having the following method steps:—machining of a metal strip (20), with the result that it acquires at least one beveled face (15, 16) which represents at least one part of a ring flank of the piston ring (10) which is to be manufactured,—formation of a piston ring (10) from the metal strip (20) which has been machined in this way and the surface of which forms an inner and an outer circumferential face (11, 12) and an upper and a lower ring flank,—hardening of the surface of the piston ring (10). Furthermore, the present invention relates to a piston ring (10) for internal combustion engines, the surface of which forms an inner and an outer circumferential face (11, 12) and an upper and a lower rink flank, wherein the surface is provided with a uniformly thick hardened layer (21).

Abstract: Disclosed is a piston (1) for a combustion engine, comprising hub bores (3) that are provided with plain bearing surfaces (5) and are used for accommodating a piston pin. In order to very effectively and inexpensively prevent the piston pin and the hub bores from jamming and wearing off, a self-lubricating coating (6) made of a thermally cured resin which contains embedded solid lubricant particles is applied directly to at least one subarea (Tb) of the plain bearing surfaces by means of rotary atomization.

Abstract: The invention relates to a piston ring whose running surface is provided with a coating containing a plastic material. Said piston ring is characterized in that the coating is composed of at least one polyamide-imide and/or at least one polyether ether ketone with embedded particles which can be embodied as hard material particles, solid lubricant particles, or metallic particles. The invention further relates to a piston/piston ring arrangement comprising at least one inventive piston ring and an agent for coating at least the running surface of the piston ring.

Abstract: The invention relates to a method for the production of wear-resistant edges for a keystone ring for internal combustion engines, by means of which the occurrence of ring edge damage during engine operation is essentially avoided, whereby a rectangular ring with inner and outer circumferential faces and an upper and lower edge is formed from a steel strip with a rectangular cross-section as starting material, comprising the following process steps: parallel grinding of the ring edges and grinding of the outer circumferential faces to give the required profile and brushing of the inner circumferential face, grinding the upper and lower ring edge (3a, 4a) to form the keystone ring, such that the piston ring retains parallel faces (3b, 4b) as stacking faces, complete nitriding of the piston ring surface by means of a gas-nitriding process (GNS) to form a nitride layer, profiling of the nitrided piston ring by grinding and lapping without machining the nitrided edges of the piston ring, stacking the piston rings

Abstract: The cylinder running surfaces of an internal combustion engine are treated with pretreatment and coating baths by using flush-in devices (5, 11) with lances insertable into the cylinder bores (1'). The flush-in devices (5, 11) can be successively connected via manifold devices (10, 12) with reservoirs (V.sub.1 to V.sub.5 ; B.sub.1 to B.sub.3) for different bath liquors. Thus, each flush-in device (5, 11) serves for the successive introduction of different bath liquors into the cylinder bores (1').

Abstract: A device for providing the running surfaces of the cylinders of internal combustion engines with a reinforcing coating. (e.g., a nickel dispersion layer including silicon carbide). The device is designed to hold and convey the cylinder block using a flow-trough process, and includes a baseplate (2) in which a pump (9) and the supply and discharge equipment (4-6) for the bath liquors are integrated. The device is transportable and enables the device to be used over a series of conventional treatment liquor baths.

Abstract: The invention relates to a gear grinding machine for straight toothed or oblique toothed spur gears, in which a main slide (2) reciprocable on the machine column and an auxiliary slide (7) reciprocable on the main slide are provided for producing the rocking motion. The direction of movement of the auxiliary slide (7) is at an angle to the direction of movement of the main slide (2). The auxiliary slide (7) is linked to a slider movable in a guide slot (9). In order to employ the machine also for form grinding, the guide slot (9) is adapted to be turned parallel to the direction of movement (II) of the slide (7) and is locked in this position. Thus, a gear grinding machine is created which is suitable both for generation grinding and form grinding.

Abstract: A gear cutting machine is provided with gearing providing additional inaccuracies to superimpose the additional inaccuracies over the normal or residual gear cutting inaccuracies of the machine. The resultant errors cut into the gears provide gears having desired noise characteristics. The additional inaccuracies are of a higher frequency than the residual errors so that noise above the audible frequency range is provided by the gears so cut. The gear cutting machine has gearing for driving the hobbing spindle and for indexing a rotary table through worm gearing. The spindle drive gear and the worm drive gear are provided with eccentric sockets for introducing the additional inaccuracies. The drive gears also are provided with deformable portions providing the drive gear teeth so that the drive gears may be deformed into polygons. The eccentric sockets and polygonal drive gears are retained in position on the shafts that they drive by a nut and intermediary element.